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6.3 ZERO CALIBRATION MENU
The MINI-SA instrument can be Auto Zeroed at any time. An Auto Zero should
only be performed in an area known to be free of toxic gas or any known
cross sensitive materials. See Section 8.0 for SCOTT INSTRUMENTS sup-
plied calibration gas cylinders. When performing an auto-zero with an oxy-
gen unit, be sure the area contains 20.9% oxygen.
To perform Zero Calibration of the sensor as described in Section 6.2, de-
press the “AUTO ZERO” pushbutton when the ZERO CALIBRATION menu
screen is displayed.
The instrument will display one of the following screens while it calibrates the
appropriate sensor.
<gas> SENSOR
For Toxic Gases ZERO CALIBRATION
2
O
2
SENSOR
For O
2
ZERO CALIBRATION
2
The instrument display will count down 2 seconds while the sensor is ze-
roed. After a successful “ZERO CALIBRATION”, the instrument will sound a
“beep” and automatically go back into the Operating Mode.
If, during the “ZERO CALIBRATION”, the unit detects that the sensor is out of
range, an error message will be displayed. See Section 7.0 for a description
of error messages.